Nonlinearity mitigation in phase-sensitively amplified optical transmission links
Licentiatavhandling, 2019

The fundamental limitations in fiber-optic communication are caused by optical amplifier noise and the nonlinear response of the optical fibers. The quantum-limited noise figure of erbium-doped fiber amplifier (EDFA) or any phase-insensitive amplifier is 3 dB. However, the noise added by
the amplification can be reduced using phase-sensitive amplifier (PSA) whose quantum-limited noise figure is 0 dB. PSAs can also compensate
for the nonlinear distortions from the optical fiber with copier-PSA implementation. At the transmitter, a copier which is nothing but a
phase-insensitive amplifier is used to create a conjugated copy of the signal. The signal and idler are co-propagated in the span, experiencing
correlated nonlinear distortions. The nonlinear distortions are reduced by the all-optical coherent superposition of the signal and idler in the
PSA.
In this work, an analytical investigation is performed for the nonlinearity mitigation using the PSAs, by calculating the residual nonlinear
distortion after the coherent superposition in PSAs. The optical bandwidth and the dispersion map dependence on the nonlinearity mitigation
in the PSAs are analytically and experimentally studied. A modified Volterra nonlinear equalizer (VNLE) is used to reduce the residual nonlinear
distortions after PSAs. Experiments were performed to show that PSAs can mitigate cross-phase modulation (XPM), which was evident
by observing the constellation diagrams. The maximum allowed launch power increase was also measured to quantify the XPM mitigation. To
the best of our knowledge, this is the first experiment that showed the mitigation of XPM in a phase-sensitively amplified transmission link.
Also, the effectiveness in mitigating self-phase modulation (SPM) and XPM using a PSA is studied.

copier-PSA

nonlinearity mitigation

phase-sensitive amplifier

self-phase modulation mitigation

low-noise amplification

optical transmission

crossphase modulation mitigation

Kollektorn, lecture room, Kemivägen 9, MC2-huset
Opponent: Dr. Bengt-Erik Olsson, Ericsson AB

Författare

Kovendhan Vijayan

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

BENJAMIN FOO, MAGNUS KARLSSON, KOVENDHAN VIJAYAN, MIKAEL MAZUR, AND PETER A. ANDREKSON, 'Analysis of nonlinearity mitigation using phase-sensitive optical parametric amplifiers'.

Optical Bandwidth Dependency of Nonlinearity Mitigation in Phase-Sensitive Amplifier Links

European Conference on Optical Communication, ECOC,; Vol. 2018-September(2018)

Paper i proceeding

Kovendhan Vijayan, Benjamin Foo, Magnus Karlsson, Peter A Andrekson, 'LONG-HAUL TRANSMISSION OF WDM SIGNALS WITH IN-LINE PHASE-SENSITIVE AMPLIFIERS'.

Kovendhan Vijayan, Benjamin Foo, Magnus Karlsson, and Peter A. Andrekson, 'Cross-phase Modulation Mitigation in Phase-sensitive Amplifier Links'.

Styrkeområden

Informations- och kommunikationsteknik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Elektroteknik och elektronik

Signalbehandling

Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology: 424

Utgivare

Chalmers tekniska högskola

Kollektorn, lecture room, Kemivägen 9, MC2-huset

Opponent: Dr. Bengt-Erik Olsson, Ericsson AB

Mer information

Senast uppdaterat

2019-11-06